William charles stiff and herbert bacharn somerville bennett



(No Model.)

W. o. STITT a. H. B. s. BENNETT.

MANUFAGTURE OP SBAMLESS TUBES.

STN

` Patented A llrnTEn STATES PATENT CEETCE,

`WlLlilAlll CHARLES S'llliF AND HERBERT. BACHARN SOMERVILLE BENNETT, CF BIRMINGHAM, COUNTY OF \VARVVICK, ENGLAND.

MANUFACTURE OF SEANILESS TUBES.

SPECFICATEON forming part of Letters Patent No. 3%0526, dated April 20, 1836.

l Application filed November 17, 1885. Serial No. 183,123. (No model.)

To a/ZZ whom, t vnf/,ty concern/.-

Be it known that we, WILLIAM CHARLES STTEE and HERBERT BACHARN SonEEvILLE BENNETT, ofthe Credenda Cold-Drawn Seam- ...less Steel Tube Company, Ledsam Street, Birmingham, in the county of Tarwiclg England, tube manufacturers, have invented certain new and useful Improvements in the Manufacture of Tubes and Ordnance of Steel and Iron, of which the following isa specification.

Our invention consists of the improvements hereinafter described in the manufacture of tubes and ordnance of steel and iron.

In the accompanying drawings we have represented an example of apparatus which we employ in carrying our invention into effect.

Figure l is a longitudinal section, Fig. 2 is a plan, and Figs. 3 and l are cross-sections, of a draw bench or frame, showing a tube in p0- sition thereon; and Fig. 5 is a longitudinal section of a tapered tube in process of treatment according to our invention.

Cnr improvements relate to a novel method of working acylindrical or other shapedingot, bloom, bar, or block from which the steel or iron tube or ordnance is made.

XVe will describe our improvements as applied to the manufacture of steel tubes.

In the ordinary method of manufacturing seamless steel tubes a solid cylindrical ingot, bloom, bar, or block is formed by rolling or hammering or by casting, and an axial hole is made in the said ingot, bloom, bar, or block by drilling` or punching, the partly-made tube being completed by rolling and drawing the same over a bulb-headed mandrel in the ordinary way, or the said hole is formed in the casting process.

According to our invention we first drillor punch a small axial hole in thesolidingot,bar, bloom,or block,and afterward enlarge the said hole to the required diameter by a drawing or other process conducted in the following manner, and we further work the said tube ashereinafter described: XVe fix the axially-perfo rated cylindrical ingot, bar, bloom, or block a on a bed or holder, b, and while the said ingot, bar, bloom, or block a is so fixed we enlarge the small axial hole ain it by means of a bulbheaded mandrel, c, worked by a powerful draw bench or machine, the rod orstem of the bulbheaded mandrel being passed through the small axial hole a in the ingot, bar, bloom, or block a and fixed to a traveling shoe7 or slipper,77 the said bulbheaded mandrel being drawn through the said block a in the direction of the arrow. By the action ofthe bulb of the mandrel c upon the axial hole through which it is drawn the saidhole is expanded tothe required diameter, the metal thus displaced expanding radially and increasing the external diameter of the ingot, bloom,

bar, or block a, which latter is at the same time consolidated or condensedand somewhat shortened in length on account of the pressure exerted by the mandrel forcing the block a against the abutment b. The ingot,bar,bloom, block, or partly-made tube c, after the hole in it has been increased in diameter to the required extent, may, by a rolling, drawing, or compressing operatioinbe diminished in diameter, and it may be again subjected to the action ofthe bulb-headed mandrel c inthe manner before described, so as to again increase the diameter ofthe hole a.

Instead of drawing the bulb-headed mandrel c through the ingot, bar, bloom, or block, the bulb-headed mandrel may be forced through the same, or it may be stationary, 'and the in got, bar, bloom, or block a drawn or forced over the same; or bot-h may be moved in directions toward or from each other. XVhenforcingthe bulbheaded mandrel c through the block a, it is necessary that the hole a shall be sufficiently enlarged to permit of the use of a mandrel having a diameter large enough to resist the endwise compression put upon it. Nhen the block a is drawn over the bulb-headed mandrel, instead of being somewhat reduced in length, it will be slightly extended.

By the above operations the ingot,bar, bloom, or block, or partly-made tube a may be consolidated to any desired extent, and an axial hole of the required diameter formed init; or,

if desired, the hole may be for apartof its distance of one diameter and for another part of a larger diameter. Then we make the axial ICO ate on the ingot, bar, bloom, or block a in a heated state. All the subsequent processes are performed While it is hot.

The improvements described may be applied to the manufacture of tubes and ordnance made of iron or steel.

Fig. 5 represents a partially-tapered tube suitable for ordnance in the process of manufacture. rlhe abutment b is formed with movable plates tting into suitable guides, b2, and provided with holes of various sizes to suit the sizes ofthe bulb-headed mandrels in nse,and at the same time to afford the maximum support to the end ofthe block a.

By our invention the manufacture of steel and iron tubes and ordnance is eeonomized,and the tubes and ordnance produced are ofa solidity and closeness of texture unattainable by the ordinary method ot' manufacture.

The product-ion of Waste metal by the drilling process hitherto employed in the manufacture of tubes and ordnance is avoided by the use of our invention.

We are aware that itis not new to confine a tube between dies, in order to prevent an increase in its external diameter and then force through its bore a mandrel having an enlarged head, whereby the diameter of the bore is inv creased and the metal consequently compressed between the said enlarged head of the mandrel and the confining dies; but this is not the equivalent of our invention.

Having now particularly described and ascertained the nature of our said invention and in what manner the saine is to be performed, we declare that What we claim ism l. The method, substantially as herein described, of mann facturing seamless tubes, which consists in forminga hole or bore through the ingot, bar, bloom, or block, and then passing through said hole or bore a mandrel having an enlarged head or bulb, whereby the diameter of the hole or bore, and also the external diameter of the blank being operated upon,is in. creased, as set forth.

2. The method, substantially as herein described, of manufacturi ng seamlesstubes, which consists in forming a hole or bore th rough the ingot, bar, bloom, or block, and then forcing through said hole or bore, While-the said ingot, bar, bloom, or block is heated and uncon fined against radial external enlargement, a mandrel having an enlarged head or bulb, whereby the diarneterofthe said bore,and also the external diameter ofthe blank,is increased, substantially as set forth.

7. C. STIFF. H. B. S. BENNETT.

Witnesses to the signature of the said Villiam Charles Stiff:

C. M. WHITE, 23 Southampton Buildings, London..

JOHN D. VENN, 9 Gmc/@church Street", London/ 'Witnesses to the signature ot' the said Het" bert Bacharn Somerville Bennett:

W. H. TYTHER, l2 St. Peters Road, Hafndsworth, Birmingham.

XV. H. HARnIsoN, Parker St., Edgbason, Birmingham. 

